drivers/acpi/ibm_acpi.c

   1 /*
   2  *  ibm_acpi.c - IBM ThinkPad ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2004-2005 Borislav Deianov <borislav@users.sf.net>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #define IBM_VERSION "0.12a"
  23
  24 /*
  25  *  Changelog:
  26  *
  27  *  2005-08-17  0.12    fix compilation on 2.6.13-rc kernels
  28  *  2005-03-17  0.11    support for 600e, 770x
  29  *                          thanks to Jamie Lentin <lentinj@dial.pipex.com>
  30  *                      support for 770e, G41
  31  *                      G40 and G41 don't have a thinklight
  32  *                      temperatures no longer experimental
  33  *                      experimental brightness control
  34  *                      experimental volume control
  35  *                      experimental fan enable/disable
  36  *  2005-01-16  0.10    fix module loading on R30, R31
  37  *  2005-01-16  0.9     support for 570, R30, R31
  38  *                      ultrabay support on A22p, A3x
  39  *                      limit arg for cmos, led, beep, drop experimental status
  40  *                      more capable led control on A21e, A22p, T20-22, X20
  41  *                      experimental temperatures and fan speed
  42  *                      experimental embedded controller register dump
  43  *                      mark more functions as __init, drop incorrect __exit
  44  *                      use MODULE_VERSION
  45  *                          thanks to Henrik Brix Andersen <brix@gentoo.org>
  46  *                      fix parameter passing on module loading
  47  *                          thanks to Rusty Russell <rusty@rustcorp.com.au>
  48  *                          thanks to Jim Radford <radford@blackbean.org>
  49  *  2004-11-08  0.8     fix init error case, don't return from a macro
  50  *                          thanks to Chris Wright <chrisw@osdl.org>
  51  *  2004-10-23  0.7     fix module loading on A21e, A22p, T20, T21, X20
  52  *                      fix led control on A21e
  53  *  2004-10-19  0.6     use acpi_bus_register_driver() to claim HKEY device
  54  *  2004-10-18  0.5     thinklight support on A21e, G40, R32, T20, T21, X20
  55  *                      proc file format changed
  56  *                      video_switch command
  57  *                      experimental cmos control
  58  *                      experimental led control
  59  *                      experimental acpi sounds
  60  *  2004-09-16  0.4     support for module parameters
  61  *                      hotkey mask can be prefixed by 0x
  62  *                      video output switching
  63  *                      video expansion control
  64  *                      ultrabay eject support
  65  *                      removed lcd brightness/on/off control, didn't work
  66  *  2004-08-17  0.3     support for R40
  67  *                      lcd off, brightness control
  68  *                      thinklight on/off
  69  *  2004-08-14  0.2     support for T series, X20
  70  *                      bluetooth enable/disable
  71  *                      hotkey events disabled by default
  72  *                      removed fan control, currently useless
  73  *  2004-08-09  0.1     initial release, support for X series
  74  */
  75
  76 #include <linux/kernel.h>
  77 #include <linux/module.h>
  78 #include <linux/init.h>
  79 #include <linux/types.h>
  80 #include <linux/proc_fs.h>
  81 #include <linux/backlight.h>
  82 #include <asm/uaccess.h>
  83
  84 #include <acpi/acpi_drivers.h>
  85 #include <acpi/acnamesp.h>
  86
  87 #define IBM_NAME "ibm"
  88 #define IBM_DESC "IBM ThinkPad ACPI Extras"
  89 #define IBM_FILE "ibm_acpi"
  90 #define IBM_URL "http://ibm-acpi.sf.net/"
  91
  92 MODULE_AUTHOR("Borislav Deianov");
  93 MODULE_DESCRIPTION(IBM_DESC);
  94 MODULE_VERSION(IBM_VERSION);
  95 MODULE_LICENSE("GPL");
  96
  97 #define IBM_DIR IBM_NAME
  98
  99 #define IBM_LOG IBM_FILE ": "
 100 #define IBM_ERR    KERN_ERR    IBM_LOG
 101 #define IBM_NOTICE KERN_NOTICE IBM_LOG
 102 #define IBM_INFO   KERN_INFO   IBM_LOG
 103 #define IBM_DEBUG  KERN_DEBUG  IBM_LOG
 104
 105 #define IBM_MAX_ACPI_ARGS 3
 106
 107 #define __unused __attribute__ ((unused))
 108
 109 static int experimental;
 110 module_param(experimental, int, 0);
 111
 112 static acpi_handle root_handle = NULL;
 113
 114 #define IBM_HANDLE(object, parent, paths...)                    \
 115         static acpi_handle  object##_handle;                    \
 116         static acpi_handle *object##_parent = &parent##_handle; \
 117         static char        *object##_path;                      \
 118         static char        *object##_paths[] = { paths }
 119
 120 /*
 121  * The following models are supported to various degrees:
 122  *
 123  * 570, 600e, 600x, 770e, 770x
 124  * A20m, A21e, A21m, A21p, A22p, A30, A30p, A31, A31p
 125  * G40, G41
 126  * R30, R31, R32, R40, R40e, R50, R50e, R50p, R51
 127  * T20, T21, T22, T23, T30, T40, T40p, T41, T41p, T42, T42p, T43
 128  * X20, X21, X22, X23, X24, X30, X31, X40
 129  *
 130  * The following models have no supported features:
 131  *
 132  * 240, 240x, i1400
 133  *
 134  * Still missing DSDTs for the following models:
 135  *
 136  * A20p, A22e, A22m
 137  * R52
 138  * S31
 139  * T43p
 140  */
 141
 142 IBM_HANDLE(ec, root, "\\_SB.PCI0.ISA.EC0",      /* 240, 240x */
 143            "\\_SB.PCI.ISA.EC",  /* 570 */
 144            "\\_SB.PCI0.ISA0.EC0",       /* 600e/x, 770e, 770x */
 145            "\\_SB.PCI0.ISA.EC", /* A21e, A2xm/p, T20-22, X20-21 */
 146            "\\_SB.PCI0.AD4S.EC0",       /* i1400, R30 */
 147            "\\_SB.PCI0.ICH3.EC0",       /* R31 */
 148            "\\_SB.PCI0.LPC.EC", /* all others */
 149     );
 150
 151 IBM_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",      /* 570 */
 152            "\\_SB.PCI0.AGP0.VID0",      /* 600e/x, 770x */
 153            "\\_SB.PCI0.VID0",   /* 770e */
 154            "\\_SB.PCI0.VID",    /* A21e, G4x, R50e, X30, X40 */
 155            "\\_SB.PCI0.AGP.VID",        /* all others */
 156     );                          /* R30, R31 */
 157
 158 IBM_HANDLE(vid2, root, "\\_SB.PCI0.AGPB.VID");  /* G41 */
 159
 160 IBM_HANDLE(cmos, root, "\\UCMS",        /* R50, R50e, R50p, R51, T4x, X31, X40 */
 161            "\\CMOS",            /* A3x, G4x, R32, T23, T30, X22-24, X30 */
 162            "\\CMS",             /* R40, R40e */
 163     );                          /* all others */
 164 #ifdef CONFIG_ACPI_IBM_DOCK
 165 IBM_HANDLE(dock, root, "\\_SB.GDCK",    /* X30, X31, X40 */
 166            "\\_SB.PCI0.DOCK",   /* 600e/x,770e,770x,A2xm/p,T20-22,X20-21 */
 167            "\\_SB.PCI0.PCI1.DOCK",      /* all others */
 168            "\\_SB.PCI.ISA.SLCE",        /* 570 */
 169     );                          /* A21e,G4x,R30,R31,R32,R40,R40e,R50e */
 170 #endif
 171 IBM_HANDLE(bay, root, "\\_SB.PCI.IDE.SECN.MAST",        /* 570 */
 172            "\\_SB.PCI0.IDE0.IDES.IDSM", /* 600e/x, 770e, 770x */
 173            "\\_SB.PCI0.IDE0.SCND.MSTR", /* all others */
 174     );                          /* A21e, R30, R31 */
 175
 176 IBM_HANDLE(bay_ej, bay, "_EJ3", /* 600e/x, A2xm/p, A3x */
 177            "_EJ0",              /* all others */
 178     );                          /* 570,A21e,G4x,R30,R31,R32,R40e,R50e */
 179
 180 IBM_HANDLE(bay2, root, "\\_SB.PCI0.IDE0.PRIM.SLAV",     /* A3x, R32 */
 181            "\\_SB.PCI0.IDE0.IDEP.IDPS", /* 600e/x, 770e, 770x */
 182     );                          /* all others */
 183
 184 IBM_HANDLE(bay2_ej, bay2, "_EJ3",       /* 600e/x, 770e, A3x */
 185            "_EJ0",              /* 770x */
 186     );                          /* all others */
 187
 188 /* don't list other alternatives as we install a notify handler on the 570 */
 189 IBM_HANDLE(pci, root, "\\_SB.PCI");     /* 570 */
 190
 191 IBM_HANDLE(hkey, ec, "\\_SB.HKEY",      /* 600e/x, 770e, 770x */
 192            "^HKEY",             /* R30, R31 */
 193            "HKEY",              /* all others */
 194     );                          /* 570 */
 195
 196 IBM_HANDLE(lght, root, "\\LGHT");       /* A21e, A2xm/p, T20-22, X20-21 */
 197 IBM_HANDLE(ledb, ec, "LEDB");   /* G4x */
 198
 199 IBM_HANDLE(led, ec, "SLED",     /* 570 */
 200            "SYSL",              /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
 201            "LED",               /* all others */
 202     );                          /* R30, R31 */
 203
 204 IBM_HANDLE(beep, ec, "BEEP");   /* all except R30, R31 */
 205 IBM_HANDLE(ecrd, ec, "ECRD");   /* 570 */
 206 IBM_HANDLE(ecwr, ec, "ECWR");   /* 570 */
 207 IBM_HANDLE(fans, ec, "FANS");   /* X31, X40 */
 208
 209 IBM_HANDLE(gfan, ec, "GFAN",    /* 570 */
 210            "\\FSPD",            /* 600e/x, 770e, 770x */
 211     );                          /* all others */
 212
 213 IBM_HANDLE(sfan, ec, "SFAN",    /* 570 */
 214            "JFNS",              /* 770x-JL */
 215     );                          /* all others */
 216
 217 #define IBM_HKEY_HID    "IBM0068"
 218 #define IBM_PCI_HID     "PNP0A03"
 219
 220 struct ibm_struct {
 221         char *name;
 222         char param[32];
 223
 224         char *hid;
 225         struct acpi_driver *driver;
 226
 227         int (*init) (void);
 228         int (*read) (char *);
 229         int (*write) (char *);
 230         void (*exit) (void);
 231
 232         void (*notify) (struct ibm_struct *, u32);
 233         acpi_handle *handle;
 234         int type;
 235         struct acpi_device *device;
 236
 237         int driver_registered;
 238         int proc_created;
 239         int init_called;
 240         int notify_installed;
 241
 242         int experimental;
 243 };
 244
 245 static struct proc_dir_entry *proc_dir = NULL;
 246
 247 static struct backlight_device *ibm_backlight_device;
 248
 249 #define onoff(status,bit) ((status) & (1 << (bit)) ? "on" : "off")
 250 #define enabled(status,bit) ((status) & (1 << (bit)) ? "enabled" : "disabled")
 251 #define strlencmp(a,b) (strncmp((a), (b), strlen(b)))
 252
 253 static int acpi_evalf(acpi_handle handle,
 254                       void *res, char *method, char *fmt, ...)
 255 {
 256         char *fmt0 = fmt;
 257         struct acpi_object_list params;
 258         union acpi_object in_objs[IBM_MAX_ACPI_ARGS];
 259         struct acpi_buffer result, *resultp;
 260         union acpi_object out_obj;
 261         acpi_status status;
 262         va_list ap;
 263         char res_type;
 264         int success;
 265         int quiet;
 266
 267         if (!*fmt) {
 268                 printk(IBM_ERR "acpi_evalf() called with empty format\n");
 269                 return 0;
 270         }
 271
 272         if (*fmt == 'q') {
 273                 quiet = 1;
 274                 fmt++;
 275         } else
 276                 quiet = 0;
 277
 278         res_type = *(fmt++);
 279
 280         params.count = 0;
 281         params.pointer = &in_objs[0];
 282
 283         va_start(ap, fmt);
 284         while (*fmt) {
 285                 char c = *(fmt++);
 286                 switch (c) {
 287                 case 'd':       /* int */
 288                         in_objs[params.count].integer.value = va_arg(ap, int);
 289                         in_objs[params.count++].type = ACPI_TYPE_INTEGER;
 290                         break;
 291                         /* add more types as needed */
 292                 default:
 293                         printk(IBM_ERR "acpi_evalf() called "
 294                                "with invalid format character '%c'\n", c);
 295                         return 0;
 296                 }
 297         }
 298         va_end(ap);
 299
 300         if (res_type != 'v') {
 301                 result.length = sizeof(out_obj);
 302                 result.pointer = &out_obj;
 303                 resultp = &result;
 304         } else
 305                 resultp = NULL;
 306
 307         status = acpi_evaluate_object(handle, method, &params, resultp);
 308
 309         switch (res_type) {
 310         case 'd':               /* int */
 311                 if (res)
 312                         *(int *)res = out_obj.integer.value;
 313                 success = status == AE_OK && out_obj.type == ACPI_TYPE_INTEGER;
 314                 break;
 315         case 'v':               /* void */
 316                 success = status == AE_OK;
 317                 break;
 318                 /* add more types as needed */
 319         default:
 320                 printk(IBM_ERR "acpi_evalf() called "
 321                        "with invalid format character '%c'\n", res_type);
 322                 return 0;
 323         }
 324
 325         if (!success && !quiet)
 326                 printk(IBM_ERR "acpi_evalf(%s, %s, ...) failed: %d\n",
 327                        method, fmt0, status);
 328
 329         return success;
 330 }
 331
 332 static void __unused acpi_print_int(acpi_handle handle, char *method)
 333 {
 334         int i;
 335
 336         if (acpi_evalf(handle, &i, method, "d"))
 337                 printk(IBM_INFO "%s = 0x%x\n", method, i);
 338         else
 339                 printk(IBM_ERR "error calling %s\n", method);
 340 }
 341
 342 static char *next_cmd(char **cmds)
 343 {
 344         char *start = *cmds;
 345         char *end;
 346
 347         while ((end = strchr(start, ',')) && end == start)
 348                 start = end + 1;
 349
 350         if (!end)
 351                 return NULL;
 352
 353         *end = 0;
 354         *cmds = end + 1;
 355         return start;
 356 }
 357
 358 static int driver_init(void)
 359 {
 360         printk(IBM_INFO "%s v%s\n", IBM_DESC, IBM_VERSION);
 361         printk(IBM_INFO "%s\n", IBM_URL);
 362
 363         return 0;
 364 }
 365
 366 static int driver_read(char *p)
 367 {
 368         int len = 0;
 369
 370         len += sprintf(p + len, "driver:\t\t%s\n", IBM_DESC);
 371         len += sprintf(p + len, "version:\t%s\n", IBM_VERSION);
 372
 373         return len;
 374 }
 375
 376 static int hotkey_supported;
 377 static int hotkey_mask_supported;
 378 static int hotkey_orig_status;
 379 static int hotkey_orig_mask;
 380
 381 static int hotkey_get(int *status, int *mask)
 382 {
 383         if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
 384                 return 0;
 385
 386         if (hotkey_mask_supported)
 387                 if (!acpi_evalf(hkey_handle, mask, "DHKN", "d"))
 388                         return 0;
 389
 390         return 1;
 391 }
 392
 393 static int hotkey_set(int status, int mask)
 394 {
 395         int i;
 396
 397         if (!acpi_evalf(hkey_handle, NULL, "MHKC", "vd", status))
 398                 return 0;
 399
 400         if (hotkey_mask_supported)
 401                 for (i = 0; i < 32; i++) {
 402                         int bit = ((1 << i) & mask) != 0;
 403                         if (!acpi_evalf(hkey_handle,
 404                                         NULL, "MHKM", "vdd", i + 1, bit))
 405                                 return 0;
 406                 }
 407
 408         return 1;
 409 }
 410
 411 static int hotkey_init(void)
 412 {
 413         /* hotkey not supported on 570 */
 414         hotkey_supported = hkey_handle != NULL;
 415
 416         if (hotkey_supported) {
 417                 /* mask not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
 418                    A30, R30, R31, T20-22, X20-21, X22-24 */
 419                 hotkey_mask_supported =
 420                     acpi_evalf(hkey_handle, NULL, "DHKN", "qv");
 421
 422                 if (!hotkey_get(&hotkey_orig_status, &hotkey_orig_mask))
 423                         return -ENODEV;
 424         }
 425
 426         return 0;
 427 }
 428
 429 static int hotkey_read(char *p)
 430 {
 431         int status, mask;
 432         int len = 0;
 433
 434         if (!hotkey_supported) {
 435                 len += sprintf(p + len, "status:\t\tnot supported\n");
 436                 return len;
 437         }
 438
 439         if (!hotkey_get(&status, &mask))
 440                 return -EIO;
 441
 442         len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 0));
 443         if (hotkey_mask_supported) {
 444                 len += sprintf(p + len, "mask:\t\t0x%04x\n", mask);
 445                 len += sprintf(p + len,
 446                                "commands:\tenable, disable, reset, <mask>\n");
 447         } else {
 448                 len += sprintf(p + len, "mask:\t\tnot supported\n");
 449                 len += sprintf(p + len, "commands:\tenable, disable, reset\n");
 450         }
 451
 452         return len;
 453 }
 454
 455 static int hotkey_write(char *buf)
 456 {
 457         int status, mask;
 458         char *cmd;
 459         int do_cmd = 0;
 460
 461         if (!hotkey_supported)
 462                 return -ENODEV;
 463
 464         if (!hotkey_get(&status, &mask))
 465                 return -EIO;
 466
 467         while ((cmd = next_cmd(&buf))) {
 468                 if (strlencmp(cmd, "enable") == 0) {
 469                         status = 1;
 470                 } else if (strlencmp(cmd, "disable") == 0) {
 471                         status = 0;
 472                 } else if (strlencmp(cmd, "reset") == 0) {
 473                         status = hotkey_orig_status;
 474                         mask = hotkey_orig_mask;
 475                 } else if (sscanf(cmd, "0x%x", &mask) == 1) {
 476                         /* mask set */
 477                 } else if (sscanf(cmd, "%x", &mask) == 1) {
 478                         /* mask set */
 479                 } else
 480                         return -EINVAL;
 481                 do_cmd = 1;
 482         }
 483
 484         if (do_cmd && !hotkey_set(status, mask))
 485                 return -EIO;
 486
 487         return 0;
 488 }
 489
 490 static void hotkey_exit(void)
 491 {
 492         if (hotkey_supported)
 493                 hotkey_set(hotkey_orig_status, hotkey_orig_mask);
 494 }
 495
 496 static void hotkey_notify(struct ibm_struct *ibm, u32 event)
 497 {
 498         int hkey;
 499
 500         if (acpi_evalf(hkey_handle, &hkey, "MHKP", "d"))
 501                 acpi_bus_generate_event(ibm->device, event, hkey);
 502         else {
 503                 printk(IBM_ERR "unknown hotkey event %d\n", event);
 504                 acpi_bus_generate_event(ibm->device, event, 0);
 505         }
 506 }
 507
 508 static int bluetooth_supported;
 509
 510 static int bluetooth_init(void)
 511 {
 512         /* bluetooth not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
 513            G4x, R30, R31, R40e, R50e, T20-22, X20-21 */
 514         bluetooth_supported = hkey_handle &&
 515             acpi_evalf(hkey_handle, NULL, "GBDC", "qv");
 516
 517         return 0;
 518 }
 519
 520 static int bluetooth_status(void)
 521 {
 522         int status;
 523
 524         if (!bluetooth_supported ||
 525             !acpi_evalf(hkey_handle, &status, "GBDC", "d"))
 526                 status = 0;
 527
 528         return status;
 529 }
 530
 531 static int bluetooth_read(char *p)
 532 {
 533         int len = 0;
 534         int status = bluetooth_status();
 535
 536         if (!bluetooth_supported)
 537                 len += sprintf(p + len, "status:\t\tnot supported\n");
 538         else if (!(status & 1))
 539                 len += sprintf(p + len, "status:\t\tnot installed\n");
 540         else {
 541                 len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 1));
 542                 len += sprintf(p + len, "commands:\tenable, disable\n");
 543         }
 544
 545         return len;
 546 }
 547
 548 static int bluetooth_write(char *buf)
 549 {
 550         int status = bluetooth_status();
 551         char *cmd;
 552         int do_cmd = 0;
 553
 554         if (!bluetooth_supported)
 555                 return -ENODEV;
 556
 557         while ((cmd = next_cmd(&buf))) {
 558                 if (strlencmp(cmd, "enable") == 0) {
 559                         status |= 2;
 560                 } else if (strlencmp(cmd, "disable") == 0) {
 561                         status &= ~2;
 562                 } else
 563                         return -EINVAL;
 564                 do_cmd = 1;
 565         }
 566
 567         if (do_cmd && !acpi_evalf(hkey_handle, NULL, "SBDC", "vd", status))
 568                 return -EIO;
 569
 570         return 0;
 571 }
 572
 573 static int wan_supported;
 574
 575 static int wan_init(void)
 576 {
 577         wan_supported = hkey_handle &&
 578             acpi_evalf(hkey_handle, NULL, "GWAN", "qv");
 579
 580         return 0;
 581 }
 582
 583 static int wan_status(void)
 584 {
 585         int status;
 586
 587         if (!wan_supported ||
 588             !acpi_evalf(hkey_handle, &status, "GWAN", "d"))
 589                 status = 0;
 590
 591         return status;
 592 }
 593
 594 static int wan_read(char *p)
 595 {
 596         int len = 0;
 597         int status = wan_status();
 598
 599         if (!wan_supported)
 600                 len += sprintf(p + len, "status:\t\tnot supported\n");
 601         else if (!(status & 1))
 602                 len += sprintf(p + len, "status:\t\tnot installed\n");
 603         else {
 604                 len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 1));
 605                 len += sprintf(p + len, "commands:\tenable, disable\n");
 606         }
 607
 608         return len;
 609 }
 610
 611 static int wan_write(char *buf)
 612 {
 613         int status = wan_status();
 614         char *cmd;
 615         int do_cmd = 0;
 616
 617         if (!wan_supported)
 618                 return -ENODEV;
 619
 620         while ((cmd = next_cmd(&buf))) {
 621                 if (strlencmp(cmd, "enable") == 0) {
 622                         status |= 2;
 623                 } else if (strlencmp(cmd, "disable") == 0) {
 624                         status &= ~2;
 625                 } else
 626                         return -EINVAL;
 627                 do_cmd = 1;
 628         }
 629
 630         if (do_cmd && !acpi_evalf(hkey_handle, NULL, "SWAN", "vd", status))
 631                 return -EIO;
 632
 633         return 0;
 634 }
 635
 636 static int video_supported;
 637 static int video_orig_autosw;
 638
 639 #define VIDEO_570 1
 640 #define VIDEO_770 2
 641 #define VIDEO_NEW 3
 642
 643 static int video_init(void)
 644 {
 645         int ivga;
 646
 647         if (vid2_handle && acpi_evalf(NULL, &ivga, "\\IVGA", "d") && ivga)
 648                 /* G41, assume IVGA doesn't change */
 649                 vid_handle = vid2_handle;
 650
 651         if (!vid_handle)
 652                 /* video switching not supported on R30, R31 */
 653                 video_supported = 0;
 654         else if (acpi_evalf(vid_handle, &video_orig_autosw, "SWIT", "qd"))
 655                 /* 570 */
 656                 video_supported = VIDEO_570;
 657         else if (acpi_evalf(vid_handle, &video_orig_autosw, "^VADL", "qd"))
 658                 /* 600e/x, 770e, 770x */
 659                 video_supported = VIDEO_770;
 660         else
 661                 /* all others */
 662                 video_supported = VIDEO_NEW;
 663
 664         return 0;
 665 }
 666
 667 static int video_status(void)
 668 {
 669         int status = 0;
 670         int i;
 671
 672         if (video_supported == VIDEO_570) {
 673                 if (acpi_evalf(NULL, &i, "\\_SB.PHS", "dd", 0x87))
 674                         status = i & 3;
 675         } else if (video_supported == VIDEO_770) {
 676                 if (acpi_evalf(NULL, &i, "\\VCDL", "d"))
 677                         status |= 0x01 * i;
 678                 if (acpi_evalf(NULL, &i, "\\VCDC", "d"))
 679                         status |= 0x02 * i;
 680         } else if (video_supported == VIDEO_NEW) {
 681                 acpi_evalf(NULL, NULL, "\\VUPS", "vd", 1);
 682                 if (acpi_evalf(NULL, &i, "\\VCDC", "d"))
 683                         status |= 0x02 * i;
 684
 685                 acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0);
 686                 if (acpi_evalf(NULL, &i, "\\VCDL", "d"))
 687                         status |= 0x01 * i;
 688                 if (acpi_evalf(NULL, &i, "\\VCDD", "d"))
 689                         status |= 0x08 * i;
 690         }
 691
 692         return status;
 693 }
 694
 695 static int video_autosw(void)
 696 {
 697         int autosw = 0;
 698
 699         if (video_supported == VIDEO_570)
 700                 acpi_evalf(vid_handle, &autosw, "SWIT", "d");
 701         else if (video_supported == VIDEO_770 || video_supported == VIDEO_NEW)
 702                 acpi_evalf(vid_handle, &autosw, "^VDEE", "d");
 703
 704         return autosw & 1;
 705 }
 706
 707 static int video_read(char *p)
 708 {
 709         int status = video_status();
 710         int autosw = video_autosw();
 711         int len = 0;
 712
 713         if (!video_supported) {
 714                 len += sprintf(p + len, "status:\t\tnot supported\n");
 715                 return len;
 716         }
 717
 718         len += sprintf(p + len, "status:\t\tsupported\n");
 719         len += sprintf(p + len, "lcd:\t\t%s\n", enabled(status, 0));
 720         len += sprintf(p + len, "crt:\t\t%s\n", enabled(status, 1));
 721         if (video_supported == VIDEO_NEW)
 722                 len += sprintf(p + len, "dvi:\t\t%s\n", enabled(status, 3));
 723         len += sprintf(p + len, "auto:\t\t%s\n", enabled(autosw, 0));
 724         len += sprintf(p + len, "commands:\tlcd_enable, lcd_disable\n");
 725         len += sprintf(p + len, "commands:\tcrt_enable, crt_disable\n");
 726         if (video_supported == VIDEO_NEW)
 727                 len += sprintf(p + len, "commands:\tdvi_enable, dvi_disable\n");
 728         len += sprintf(p + len, "commands:\tauto_enable, auto_disable\n");
 729         len += sprintf(p + len, "commands:\tvideo_switch, expand_toggle\n");
 730
 731         return len;
 732 }
 733
 734 static int video_switch(void)
 735 {
 736         int autosw = video_autosw();
 737         int ret;
 738
 739         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
 740                 return -EIO;
 741         ret = video_supported == VIDEO_570 ?
 742             acpi_evalf(ec_handle, NULL, "_Q16", "v") :
 743             acpi_evalf(vid_handle, NULL, "VSWT", "v");
 744         acpi_evalf(vid_handle, NULL, "_DOS", "vd", autosw);
 745
 746         return ret;
 747 }
 748
 749 static int video_expand(void)
 750 {
 751         if (video_supported == VIDEO_570)
 752                 return acpi_evalf(ec_handle, NULL, "_Q17", "v");
 753         else if (video_supported == VIDEO_770)
 754                 return acpi_evalf(vid_handle, NULL, "VEXP", "v");
 755         else
 756                 return acpi_evalf(NULL, NULL, "\\VEXP", "v");
 757 }
 758
 759 static int video_switch2(int status)
 760 {
 761         int ret;
 762
 763         if (video_supported == VIDEO_570) {
 764                 ret = acpi_evalf(NULL, NULL,
 765                                  "\\_SB.PHS2", "vdd", 0x8b, status | 0x80);
 766         } else if (video_supported == VIDEO_770) {
 767                 int autosw = video_autosw();
 768                 if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
 769                         return -EIO;
 770
 771                 ret = acpi_evalf(vid_handle, NULL,
 772                                  "ASWT", "vdd", status * 0x100, 0);
 773
 774                 acpi_evalf(vid_handle, NULL, "_DOS", "vd", autosw);
 775         } else {
 776                 ret = acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0x80) &&
 777                     acpi_evalf(NULL, NULL, "\\VSDS", "vdd", status, 1);
 778         }
 779
 780         return ret;
 781 }
 782
 783 static int video_write(char *buf)
 784 {
 785         char *cmd;
 786         int enable, disable, status;
 787
 788         if (!video_supported)
 789                 return -ENODEV;
 790
 791         enable = disable = 0;
 792
 793         while ((cmd = next_cmd(&buf))) {
 794                 if (strlencmp(cmd, "lcd_enable") == 0) {
 795                         enable |= 0x01;
 796                 } else if (strlencmp(cmd, "lcd_disable") == 0) {
 797                         disable |= 0x01;
 798                 } else if (strlencmp(cmd, "crt_enable") == 0) {
 799                         enable |= 0x02;
 800                 } else if (strlencmp(cmd, "crt_disable") == 0) {
 801                         disable |= 0x02;
 802                 } else if (video_supported == VIDEO_NEW &&
 803                            strlencmp(cmd, "dvi_enable") == 0) {
 804                         enable |= 0x08;
 805                 } else if (video_supported == VIDEO_NEW &&
 806                            strlencmp(cmd, "dvi_disable") == 0) {
 807                         disable |= 0x08;
 808                 } else if (strlencmp(cmd, "auto_enable") == 0) {
 809                         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
 810                                 return -EIO;
 811                 } else if (strlencmp(cmd, "auto_disable") == 0) {
 812                         if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 0))
 813                                 return -EIO;
 814                 } else if (strlencmp(cmd, "video_switch") == 0) {
 815                         if (!video_switch())
 816                                 return -EIO;
 817                 } else if (strlencmp(cmd, "expand_toggle") == 0) {
 818                         if (!video_expand())
 819                                 return -EIO;
 820                 } else
 821                         return -EINVAL;
 822         }
 823
 824         if (enable || disable) {
 825                 status = (video_status() & 0x0f & ~disable) | enable;
 826                 if (!video_switch2(status))
 827                         return -EIO;
 828         }
 829
 830         return 0;
 831 }
 832
 833 static void video_exit(void)
 834 {
 835         acpi_evalf(vid_handle, NULL, "_DOS", "vd", video_orig_autosw);
 836 }
 837
 838 static int light_supported;
 839 static int light_status_supported;
 840
 841 static int light_init(void)
 842 {
 843         /* light not supported on 570, 600e/x, 770e, 770x, G4x, R30, R31 */
 844         light_supported = (cmos_handle || lght_handle) && !ledb_handle;
 845
 846         if (light_supported)
 847                 /* light status not supported on
 848                    570, 600e/x, 770e, 770x, G4x, R30, R31, R32, X20 */
 849                 light_status_supported = acpi_evalf(ec_handle, NULL,
 850                                                     "KBLT", "qv");
 851
 852         return 0;
 853 }
 854
 855 static int light_read(char *p)
 856 {
 857         int len = 0;
 858         int status = 0;
 859
 860         if (!light_supported) {
 861                 len += sprintf(p + len, "status:\t\tnot supported\n");
 862         } else if (!light_status_supported) {
 863                 len += sprintf(p + len, "status:\t\tunknown\n");
 864                 len += sprintf(p + len, "commands:\ton, off\n");
 865         } else {
 866                 if (!acpi_evalf(ec_handle, &status, "KBLT", "d"))
 867                         return -EIO;
 868                 len += sprintf(p + len, "status:\t\t%s\n", onoff(status, 0));
 869                 len += sprintf(p + len, "commands:\ton, off\n");
 870         }
 871
 872         return len;
 873 }
 874
 875 static int light_write(char *buf)
 876 {
 877         int cmos_cmd, lght_cmd;
 878         char *cmd;
 879         int success;
 880
 881         if (!light_supported)
 882                 return -ENODEV;
 883
 884         while ((cmd = next_cmd(&buf))) {
 885                 if (strlencmp(cmd, "on") == 0) {
 886                         cmos_cmd = 0x0c;
 887                         lght_cmd = 1;
 888                 } else if (strlencmp(cmd, "off") == 0) {
 889                         cmos_cmd = 0x0d;
 890                         lght_cmd = 0;
 891                 } else
 892                         return -EINVAL;
 893
 894                 success = cmos_handle ?
 895                     acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd) :
 896                     acpi_evalf(lght_handle, NULL, NULL, "vd", lght_cmd);
 897                 if (!success)
 898                         return -EIO;
 899         }
 900
 901         return 0;
 902 }
 903
 904 static int _sta(acpi_handle handle)
 905 {
 906         int status;
 907
 908         if (!handle || !acpi_evalf(handle, &status, "_STA", "d"))
 909                 status = 0;
 910
 911         return status;
 912 }
 913 #ifdef CONFIG_ACPI_IBM_DOCK
 914 #define dock_docked() (_sta(dock_handle) & 1)
 915
 916 static int dock_read(char *p)
 917 {
 918         int len = 0;
 919         int docked = dock_docked();
 920
 921         if (!dock_handle)
 922                 len += sprintf(p + len, "status:\t\tnot supported\n");
 923         else if (!docked)
 924                 len += sprintf(p + len, "status:\t\tundocked\n");
 925         else {
 926                 len += sprintf(p + len, "status:\t\tdocked\n");
 927                 len += sprintf(p + len, "commands:\tdock, undock\n");
 928         }
 929
 930         return len;
 931 }
 932
 933 static int dock_write(char *buf)
 934 {
 935         char *cmd;
 936
 937         if (!dock_docked())
 938                 return -ENODEV;
 939
 940         while ((cmd = next_cmd(&buf))) {
 941                 if (strlencmp(cmd, "undock") == 0) {
 942                         if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 0) ||
 943                             !acpi_evalf(dock_handle, NULL, "_EJ0", "vd", 1))
 944                                 return -EIO;
 945                 } else if (strlencmp(cmd, "dock") == 0) {
 946                         if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 1))
 947                                 return -EIO;
 948                 } else
 949                         return -EINVAL;
 950         }
 951
 952         return 0;
 953 }
 954
 955 static void dock_notify(struct ibm_struct *ibm, u32 event)
 956 {
 957         int docked = dock_docked();
 958         int pci = ibm->hid && strstr(ibm->hid, IBM_PCI_HID);
 959
 960         if (event == 1 && !pci) /* 570 */
 961                 acpi_bus_generate_event(ibm->device, event, 1); /* button */
 962         else if (event == 1 && pci)     /* 570 */
 963                 acpi_bus_generate_event(ibm->device, event, 3); /* dock */
 964         else if (event == 3 && docked)
 965                 acpi_bus_generate_event(ibm->device, event, 1); /* button */
 966         else if (event == 3 && !docked)
 967                 acpi_bus_generate_event(ibm->device, event, 2); /* undock */
 968         else if (event == 0 && docked)
 969                 acpi_bus_generate_event(ibm->device, event, 3); /* dock */
 970         else {
 971                 printk(IBM_ERR "unknown dock event %d, status %d\n",
 972                        event, _sta(dock_handle));
 973                 acpi_bus_generate_event(ibm->device, event, 0); /* unknown */
 974         }
 975 }
 976 #endif
 977
 978 static int bay_status_supported;
 979 static int bay_status2_supported;
 980 static int bay_eject_supported;
 981 static int bay_eject2_supported;
 982
 983 static int bay_init(void)
 984 {
 985         bay_status_supported = bay_handle &&
 986             acpi_evalf(bay_handle, NULL, "_STA", "qv");
 987         bay_status2_supported = bay2_handle &&
 988             acpi_evalf(bay2_handle, NULL, "_STA", "qv");
 989
 990         bay_eject_supported = bay_handle && bay_ej_handle &&
 991             (strlencmp(bay_ej_path, "_EJ0") == 0 || experimental);
 992         bay_eject2_supported = bay2_handle && bay2_ej_handle &&
 993             (strlencmp(bay2_ej_path, "_EJ0") == 0 || experimental);
 994
 995         return 0;
 996 }
 997
 998 #define bay_occupied(b) (_sta(b##_handle) & 1)
 999
1000 static int bay_read(char *p)
1001 {
1002         int len = 0;
1003         int occupied = bay_occupied(bay);
1004         int occupied2 = bay_occupied(bay2);
1005         int eject, eject2;
1006
1007         len += sprintf(p + len, "status:\t\t%s\n", bay_status_supported ?
1008                        (occupied ? "occupied" : "unoccupied") :
1009                        "not supported");
1010         if (bay_status2_supported)
1011                 len += sprintf(p + len, "status2:\t%s\n", occupied2 ?
1012                                "occupied" : "unoccupied");
1013
1014         eject = bay_eject_supported && occupied;
1015         eject2 = bay_eject2_supported && occupied2;
1016
1017         if (eject && eject2)
1018                 len += sprintf(p + len, "commands:\teject, eject2\n");
1019         else if (eject)
1020                 len += sprintf(p + len, "commands:\teject\n");
1021         else if (eject2)
1022                 len += sprintf(p + len, "commands:\teject2\n");
1023
1024         return len;
1025 }
1026
1027 static int bay_write(char *buf)
1028 {
1029         char *cmd;
1030
1031         if (!bay_eject_supported && !bay_eject2_supported)
1032                 return -ENODEV;
1033
1034         while ((cmd = next_cmd(&buf))) {
1035                 if (bay_eject_supported && strlencmp(cmd, "eject") == 0) {
1036                         if (!acpi_evalf(bay_ej_handle, NULL, NULL, "vd", 1))
1037                                 return -EIO;
1038                 } else if (bay_eject2_supported &&
1039                            strlencmp(cmd, "eject2") == 0) {
1040                         if (!acpi_evalf(bay2_ej_handle, NULL, NULL, "vd", 1))
1041                                 return -EIO;
1042                 } else
1043                         return -EINVAL;
1044         }
1045
1046         return 0;
1047 }
1048
1049 static void bay_notify(struct ibm_struct *ibm, u32 event)
1050 {
1051         acpi_bus_generate_event(ibm->device, event, 0);
1052 }
1053
1054 static int cmos_read(char *p)
1055 {
1056         int len = 0;
1057
1058         /* cmos not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
1059            R30, R31, T20-22, X20-21 */
1060         if (!cmos_handle)
1061                 len += sprintf(p + len, "status:\t\tnot supported\n");
1062         else {
1063                 len += sprintf(p + len, "status:\t\tsupported\n");
1064                 len += sprintf(p + len, "commands:\t<cmd> (<cmd> is 0-21)\n");
1065         }
1066
1067         return len;
1068 }
1069
1070 static int cmos_eval(int cmos_cmd)
1071 {
1072         if (cmos_handle)
1073                 return acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd);
1074         else
1075                 return 1;
1076 }
1077
1078 static int cmos_write(char *buf)
1079 {
1080         char *cmd;
1081         int cmos_cmd;
1082
1083         if (!cmos_handle)
1084                 return -EINVAL;
1085
1086         while ((cmd = next_cmd(&buf))) {
1087                 if (sscanf(cmd, "%u", &cmos_cmd) == 1 &&
1088                     cmos_cmd >= 0 && cmos_cmd <= 21) {
1089                         /* cmos_cmd set */
1090                 } else
1091                         return -EINVAL;
1092
1093                 if (!cmos_eval(cmos_cmd))
1094                         return -EIO;
1095         }
1096
1097         return 0;
1098 }
1099
1100 static int led_supported;
1101
1102 #define LED_570 1
1103 #define LED_OLD 2
1104 #define LED_NEW 3
1105
1106 static int led_init(void)
1107 {
1108         if (!led_handle)
1109                 /* led not supported on R30, R31 */
1110                 led_supported = 0;
1111         else if (strlencmp(led_path, "SLED") == 0)
1112                 /* 570 */
1113                 led_supported = LED_570;
1114         else if (strlencmp(led_path, "SYSL") == 0)
1115                 /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
1116                 led_supported = LED_OLD;
1117         else
1118                 /* all others */
1119                 led_supported = LED_NEW;
1120
1121         return 0;
1122 }
1123
1124 #define led_status(s) ((s) == 0 ? "off" : ((s) == 1 ? "on" : "blinking"))
1125
1126 static int led_read(char *p)
1127 {
1128         int len = 0;
1129
1130         if (!led_supported) {
1131                 len += sprintf(p + len, "status:\t\tnot supported\n");
1132                 return len;
1133         }
1134         len += sprintf(p + len, "status:\t\tsupported\n");
1135
1136         if (led_supported == LED_570) {
1137                 /* 570 */
1138                 int i, status;
1139                 for (i = 0; i < 8; i++) {
1140                         if (!acpi_evalf(ec_handle,
1141                                         &status, "GLED", "dd", 1 << i))
1142                                 return -EIO;
1143                         len += sprintf(p + len, "%d:\t\t%s\n",
1144                                        i, led_status(status));
1145                 }
1146         }
1147
1148         len += sprintf(p + len, "commands:\t"
1149                        "<led> on, <led> off, <led> blink (<led> is 0-7)\n");
1150
1151         return len;
1152 }
1153
1154 /* off, on, blink */
1155 static const int led_sled_arg1[] = { 0, 1, 3 };
1156 static const int led_exp_hlbl[] = { 0, 0, 1 };  /* led# * */
1157 static const int led_exp_hlcl[] = { 0, 1, 1 };  /* led# * */
1158 static const int led_led_arg1[] = { 0, 0x80, 0xc0 };
1159
1160 #define EC_HLCL 0x0c
1161 #define EC_HLBL 0x0d
1162 #define EC_HLMS 0x0e
1163
1164 static int led_write(char *buf)
1165 {
1166         char *cmd;
1167         int led, ind, ret;
1168
1169         if (!led_supported)
1170                 return -ENODEV;
1171
1172         while ((cmd = next_cmd(&buf))) {
1173                 if (sscanf(cmd, "%d", &led) != 1 || led < 0 || led > 7)
1174                         return -EINVAL;
1175
1176                 if (strstr(cmd, "off")) {
1177                         ind = 0;
1178                 } else if (strstr(cmd, "on")) {
1179                         ind = 1;
1180                 } else if (strstr(cmd, "blink")) {
1181                         ind = 2;
1182                 } else
1183                         return -EINVAL;
1184
1185                 if (led_supported == LED_570) {
1186                         /* 570 */
1187                         led = 1 << led;
1188                         if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
1189                                         led, led_sled_arg1[ind]))
1190                                 return -EIO;
1191                 } else if (led_supported == LED_OLD) {
1192                         /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20 */
1193                         led = 1 << led;
1194                         ret = ec_write(EC_HLMS, led);
1195                         if (ret >= 0)
1196                                 ret =
1197                                     ec_write(EC_HLBL, led * led_exp_hlbl[ind]);
1198                         if (ret >= 0)
1199                                 ret =
1200                                     ec_write(EC_HLCL, led * led_exp_hlcl[ind]);
1201                         if (ret < 0)
1202                                 return ret;
1203                 } else {
1204                         /* all others */
1205                         if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
1206                                         led, led_led_arg1[ind]))
1207                                 return -EIO;
1208                 }
1209         }
1210
1211         return 0;
1212 }
1213
1214 static int beep_read(char *p)
1215 {
1216         int len = 0;
1217
1218         if (!beep_handle)
1219                 len += sprintf(p + len, "status:\t\tnot supported\n");
1220         else {
1221                 len += sprintf(p + len, "status:\t\tsupported\n");
1222                 len += sprintf(p + len, "commands:\t<cmd> (<cmd> is 0-17)\n");
1223         }
1224
1225         return len;
1226 }
1227
1228 static int beep_write(char *buf)
1229 {
1230         char *cmd;
1231         int beep_cmd;
1232
1233         if (!beep_handle)
1234                 return -ENODEV;
1235
1236         while ((cmd = next_cmd(&buf))) {
1237                 if (sscanf(cmd, "%u", &beep_cmd) == 1 &&
1238                     beep_cmd >= 0 && beep_cmd <= 17) {
1239                         /* beep_cmd set */
1240                 } else
1241                         return -EINVAL;
1242                 if (!acpi_evalf(beep_handle, NULL, NULL, "vdd", beep_cmd, 0))
1243                         return -EIO;
1244         }
1245
1246         return 0;
1247 }
1248
1249 static int acpi_ec_read(int i, u8 * p)
1250 {
1251         int v;
1252
1253         if (ecrd_handle) {
1254                 if (!acpi_evalf(ecrd_handle, &v, NULL, "dd", i))
1255                         return 0;
1256                 *p = v;
1257         } else {
1258                 if (ec_read(i, p) < 0)
1259                         return 0;
1260         }
1261
1262         return 1;
1263 }
1264
1265 static int acpi_ec_write(int i, u8 v)
1266 {
1267         if (ecwr_handle) {
1268                 if (!acpi_evalf(ecwr_handle, NULL, NULL, "vdd", i, v))
1269                         return 0;
1270         } else {
1271                 if (ec_write(i, v) < 0)
1272                         return 0;
1273         }
1274
1275         return 1;
1276 }
1277
1278 static int thermal_tmp_supported;
1279 static int thermal_updt_supported;
1280
1281 static int thermal_init(void)
1282 {
1283         /* temperatures not supported on 570, G4x, R30, R31, R32 */
1284         thermal_tmp_supported = acpi_evalf(ec_handle, NULL, "TMP7", "qv");
1285
1286         /* 600e/x, 770e, 770x */
1287         thermal_updt_supported = acpi_evalf(ec_handle, NULL, "UPDT", "qv");
1288
1289         return 0;
1290 }
1291
1292 static int thermal_read(char *p)
1293 {
1294         int len = 0;
1295
1296         if (!thermal_tmp_supported)
1297                 len += sprintf(p + len, "temperatures:\tnot supported\n");
1298         else {
1299                 int i, t;
1300                 char tmpi[] = "TMPi";
1301                 s8 tmp[8];
1302
1303                 if (thermal_updt_supported)
1304                         if (!acpi_evalf(ec_handle, NULL, "UPDT", "v"))
1305                                 return -EIO;
1306
1307                 for (i = 0; i < 8; i++) {
1308                         tmpi[3] = '0' + i;
1309                         if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
1310                                 return -EIO;
1311                         if (thermal_updt_supported)
1312                                 tmp[i] = (t - 2732 + 5) / 10;
1313                         else
1314                                 tmp[i] = t;
1315                 }
1316
1317                 len += sprintf(p + len,
1318                                "temperatures:\t%d %d %d %d %d %d %d %d\n",
1319                                tmp[0], tmp[1], tmp[2], tmp[3],
1320                                tmp[4], tmp[5], tmp[6], tmp[7]);
1321         }
1322
1323         return len;
1324 }
1325
1326 static u8 ecdump_regs[256];
1327
1328 static int ecdump_read(char *p)
1329 {
1330         int len = 0;
1331         int i, j;
1332         u8 v;
1333
1334         len += sprintf(p + len, "EC      "
1335                        " +00 +01 +02 +03 +04 +05 +06 +07"
1336                        " +08 +09 +0a +0b +0c +0d +0e +0f\n");
1337         for (i = 0; i < 256; i += 16) {
1338                 len += sprintf(p + len, "EC 0x%02x:", i);
1339                 for (j = 0; j < 16; j++) {
1340                         if (!acpi_ec_read(i + j, &v))
1341                                 break;
1342                         if (v != ecdump_regs[i + j])
1343                                 len += sprintf(p + len, " *%02x", v);
1344                         else
1345                                 len += sprintf(p + len, "  %02x", v);
1346                         ecdump_regs[i + j] = v;
1347                 }
1348                 len += sprintf(p + len, "\n");
1349                 if (j != 16)
1350                         break;
1351         }
1352
1353         /* These are way too dangerous to advertise openly... */
1354 #if 0
1355         len += sprintf(p + len, "commands:\t0x<offset> 0x<value>"
1356                        " (<offset> is 00-ff, <value> is 00-ff)\n");
1357         len += sprintf(p + len, "commands:\t0x<offset> <value>  "
1358                        " (<offset> is 00-ff, <value> is 0-255)\n");
1359 #endif
1360         return len;
1361 }
1362
1363 static int ecdump_write(char *buf)
1364 {
1365         char *cmd;
1366         int i, v;
1367
1368         while ((cmd = next_cmd(&buf))) {
1369                 if (sscanf(cmd, "0x%x 0x%x", &i, &v) == 2) {
1370                         /* i and v set */
1371                 } else if (sscanf(cmd, "0x%x %u", &i, &v) == 2) {
1372                         /* i and v set */
1373                 } else
1374                         return -EINVAL;
1375                 if (i >= 0 && i < 256 && v >= 0 && v < 256) {
1376                         if (!acpi_ec_write(i, v))
1377                                 return -EIO;
1378                 } else
1379                         return -EINVAL;
1380         }
1381
1382         return 0;
1383 }
1384
1385 static int brightness_offset = 0x31;
1386
1387 static int brightness_get(struct backlight_device *bd)
1388 {
1389        u8 level;
1390        if (!acpi_ec_read(brightness_offset, &level))
1391                return -EIO;
1392
1393        level &= 0x7;
1394        return level;
1395 }
1396
1397 static int brightness_read(char *p)
1398 {
1399         int len = 0;
1400         int level;
1401
1402         if ((level = brightness_get(NULL)) < 0) {
1403                 len += sprintf(p + len, "level:\t\tunreadable\n");
1404         } else {
1405                 len += sprintf(p + len, "level:\t\t%d\n", level & 0x7);
1406                 len += sprintf(p + len, "commands:\tup, down\n");
1407                 len += sprintf(p + len, "commands:\tlevel <level>"
1408                                " (<level> is 0-7)\n");
1409         }
1410
1411         return len;
1412 }
1413
1414 #define BRIGHTNESS_UP   4
1415 #define BRIGHTNESS_DOWN 5
1416
1417 static int brightness_set(int value)
1418 {
1419         int cmos_cmd, inc, i;
1420         int current_value = brightness_get(NULL);
1421
1422         value &= 7;
1423
1424         cmos_cmd = value > current_value ? BRIGHTNESS_UP : BRIGHTNESS_DOWN;
1425         inc = value > current_value ? 1 : -1;
1426         for (i = current_value; i != value; i += inc) {
1427                 if (!cmos_eval(cmos_cmd))
1428                         return -EIO;
1429                 if (!acpi_ec_write(brightness_offset, i + inc))
1430                         return -EIO;
1431         }
1432
1433         return 0;
1434 }
1435
1436 static int brightness_write(char *buf)
1437 {
1438         int level;
1439         int new_level;
1440         char *cmd;
1441
1442         while ((cmd = next_cmd(&buf))) {
1443                 if ((level = brightness_get(NULL)) < 0)
1444                         return level;
1445                 level &= 7;
1446
1447                 if (strlencmp(cmd, "up") == 0) {
1448                         new_level = level == 7 ? 7 : level + 1;
1449                 } else if (strlencmp(cmd, "down") == 0) {
1450                         new_level = level == 0 ? 0 : level - 1;
1451                 } else if (sscanf(cmd, "level %d", &new_level) == 1 &&
1452                            new_level >= 0 && new_level <= 7) {
1453                         /* new_level set */
1454                 } else
1455                         return -EINVAL;
1456
1457                 brightness_set(new_level);
1458         }
1459
1460         return 0;
1461 }
1462
1463 static int brightness_update_status(struct backlight_device *bd)
1464 {
1465         return brightness_set(bd->props->brightness);
1466 }
1467
1468 static int volume_offset = 0x30;
1469
1470 static int volume_read(char *p)
1471 {
1472         int len = 0;
1473         u8 level;
1474
1475         if (!acpi_ec_read(volume_offset, &level)) {
1476                 len += sprintf(p + len, "level:\t\tunreadable\n");
1477         } else {
1478                 len += sprintf(p + len, "level:\t\t%d\n", level & 0xf);
1479                 len += sprintf(p + len, "mute:\t\t%s\n", onoff(level, 6));
1480                 len += sprintf(p + len, "commands:\tup, down, mute\n");
1481                 len += sprintf(p + len, "commands:\tlevel <level>"
1482                                " (<level> is 0-15)\n");
1483         }
1484
1485         return len;
1486 }
1487
1488 #define VOLUME_DOWN     0
1489 #define VOLUME_UP       1
1490 #define VOLUME_MUTE     2
1491
1492 static int volume_write(char *buf)
1493 {
1494         int cmos_cmd, inc, i;
1495         u8 level, mute;
1496         int new_level, new_mute;
1497         char *cmd;
1498
1499         while ((cmd = next_cmd(&buf))) {
1500                 if (!acpi_ec_read(volume_offset, &level))
1501                         return -EIO;
1502                 new_mute = mute = level & 0x40;
1503                 new_level = level = level & 0xf;
1504
1505                 if (strlencmp(cmd, "up") == 0) {
1506                         if (mute)
1507                                 new_mute = 0;
1508                         else
1509                                 new_level = level == 15 ? 15 : level + 1;
1510                 } else if (strlencmp(cmd, "down") == 0) {
1511                         if (mute)
1512                                 new_mute = 0;
1513                         else
1514                                 new_level = level == 0 ? 0 : level - 1;
1515                 } else if (sscanf(cmd, "level %d", &new_level) == 1 &&
1516                            new_level >= 0 && new_level <= 15) {
1517                         /* new_level set */
1518                 } else if (strlencmp(cmd, "mute") == 0) {
1519                         new_mute = 0x40;
1520                 } else
1521                         return -EINVAL;
1522
1523                 if (new_level != level) {       /* mute doesn't change */
1524                         cmos_cmd = new_level > level ? VOLUME_UP : VOLUME_DOWN;
1525                         inc = new_level > level ? 1 : -1;
1526
1527                         if (mute && (!cmos_eval(cmos_cmd) ||
1528                                      !acpi_ec_write(volume_offset, level)))
1529                                 return -EIO;
1530
1531                         for (i = level; i != new_level; i += inc)
1532                                 if (!cmos_eval(cmos_cmd) ||
1533                                     !acpi_ec_write(volume_offset, i + inc))
1534                                         return -EIO;
1535
1536                         if (mute && (!cmos_eval(VOLUME_MUTE) ||
1537                                      !acpi_ec_write(volume_offset,
1538                                                     new_level + mute)))
1539                                 return -EIO;
1540                 }
1541
1542                 if (new_mute != mute) { /* level doesn't change */
1543                         cmos_cmd = new_mute ? VOLUME_MUTE : VOLUME_UP;
1544
1545                         if (!cmos_eval(cmos_cmd) ||
1546                             !acpi_ec_write(volume_offset, level + new_mute))
1547                                 return -EIO;
1548                 }
1549         }
1550
1551         return 0;
1552 }
1553
1554 static int fan_status_offset = 0x2f;
1555 static int fan_rpm_offset = 0x84;
1556
1557 static int fan_read(char *p)
1558 {
1559         int len = 0;
1560         int s;
1561         u8 lo, hi, status;
1562
1563         if (gfan_handle) {
1564                 /* 570, 600e/x, 770e, 770x */
1565                 if (!acpi_evalf(gfan_handle, &s, NULL, "d"))
1566                         return -EIO;
1567
1568                 len += sprintf(p + len, "level:\t\t%d\n", s);
1569         } else {
1570                 /* all except 570, 600e/x, 770e, 770x */
1571                 if (!acpi_ec_read(fan_status_offset, &status))
1572                         len += sprintf(p + len, "status:\t\tunreadable\n");
1573                 else
1574                         len += sprintf(p + len, "status:\t\t%s\n",
1575                                        enabled(status, 7));
1576
1577                 if (!acpi_ec_read(fan_rpm_offset, &lo) ||
1578                     !acpi_ec_read(fan_rpm_offset + 1, &hi))
1579                         len += sprintf(p + len, "speed:\t\tunreadable\n");
1580                 else
1581                         len += sprintf(p + len, "speed:\t\t%d\n",
1582                                        (hi << 8) + lo);
1583         }
1584
1585         if (sfan_handle)
1586                 /* 570, 770x-JL */
1587                 len += sprintf(p + len, "commands:\tlevel <level>"
1588                                " (<level> is 0-7)\n");
1589         if (!gfan_handle)
1590                 /* all except 570, 600e/x, 770e, 770x */
1591                 len += sprintf(p + len, "commands:\tenable, disable\n");
1592         if (fans_handle)
1593                 /* X31, X40 */
1594                 len += sprintf(p + len, "commands:\tspeed <speed>"
1595                                " (<speed> is 0-65535)\n");
1596
1597         return len;
1598 }
1599
1600 static int fan_write(char *buf)
1601 {
1602         char *cmd;
1603         int level, speed;
1604
1605         while ((cmd = next_cmd(&buf))) {
1606                 if (sfan_handle &&
1607                     sscanf(cmd, "level %d", &level) == 1 &&
1608                     level >= 0 && level <= 7) {
1609                         /* 570, 770x-JL */
1610                         if (!acpi_evalf(sfan_handle, NULL, NULL, "vd", level))
1611                                 return -EIO;
1612                 } else if (!gfan_handle && strlencmp(cmd, "enable") == 0) {
1613                         /* all except 570, 600e/x, 770e, 770x */
1614                         if (!acpi_ec_write(fan_status_offset, 0x80))
1615                                 return -EIO;
1616                 } else if (!gfan_handle && strlencmp(cmd, "disable") == 0) {
1617                         /* all except 570, 600e/x, 770e, 770x */
1618                         if (!acpi_ec_write(fan_status_offset, 0x00))
1619                                 return -EIO;
1620                 } else if (fans_handle &&
1621                            sscanf(cmd, "speed %d", &speed) == 1 &&
1622                            speed >= 0 && speed <= 65535) {
1623                         /* X31, X40 */
1624                         if (!acpi_evalf(fans_handle, NULL, NULL, "vddd",
1625                                         speed, speed, speed))
1626                                 return -EIO;
1627                 } else
1628                         return -EINVAL;
1629         }
1630
1631         return 0;
1632 }
1633
1634 static struct ibm_struct ibms[] = {
1635         {
1636          .name = "driver",
1637          .init = driver_init,
1638          .read = driver_read,
1639          },
1640         {
1641          .name = "hotkey",
1642          .hid = IBM_HKEY_HID,
1643          .init = hotkey_init,
1644          .read = hotkey_read,
1645          .write = hotkey_write,
1646          .exit = hotkey_exit,
1647          .notify = hotkey_notify,
1648          .handle = &hkey_handle,
1649          .type = ACPI_DEVICE_NOTIFY,
1650          },
1651         {
1652          .name = "bluetooth",
1653          .init = bluetooth_init,
1654          .read = bluetooth_read,
1655          .write = bluetooth_write,
1656          },
1657         {
1658          .name = "wan",
1659          .init = wan_init,
1660          .read = wan_read,
1661          .write = wan_write,
1662          .experimental = 1,
1663          },
1664         {
1665          .name = "video",
1666          .init = video_init,
1667          .read = video_read,
1668          .write = video_write,
1669          .exit = video_exit,
1670          },
1671         {
1672          .name = "light",
1673          .init = light_init,
1674          .read = light_read,
1675          .write = light_write,
1676          },
1677 #ifdef CONFIG_ACPI_IBM_DOCK
1678         {
1679          .name = "dock",
1680          .read = dock_read,
1681          .write = dock_write,
1682          .notify = dock_notify,
1683          .handle = &dock_handle,
1684          .type = ACPI_SYSTEM_NOTIFY,
1685          },
1686         {
1687          .name = "dock",
1688          .hid = IBM_PCI_HID,
1689          .notify = dock_notify,
1690          .handle = &pci_handle,
1691          .type = ACPI_SYSTEM_NOTIFY,
1692          },
1693 #endif
1694         {
1695          .name = "bay",
1696          .init = bay_init,
1697          .read = bay_read,
1698          .write = bay_write,
1699          .notify = bay_notify,
1700          .handle = &bay_handle,
1701          .type = ACPI_SYSTEM_NOTIFY,
1702          },
1703         {
1704          .name = "cmos",
1705          .read = cmos_read,
1706          .write = cmos_write,
1707          },
1708         {
1709          .name = "led",
1710          .init = led_init,
1711          .read = led_read,
1712          .write = led_write,
1713          },
1714         {
1715          .name = "beep",
1716          .read = beep_read,
1717          .write = beep_write,
1718          },
1719         {
1720          .name = "thermal",
1721          .init = thermal_init,
1722          .read = thermal_read,
1723          },
1724         {
1725          .name = "ecdump",
1726          .read = ecdump_read,
1727          .write = ecdump_write,
1728          .experimental = 1,
1729          },
1730         {
1731          .name = "brightness",
1732          .read = brightness_read,
1733          .write = brightness_write,
1734          },
1735         {
1736          .name = "volume",
1737          .read = volume_read,
1738          .write = volume_write,
1739          },
1740         {
1741          .name = "fan",
1742          .read = fan_read,
1743          .write = fan_write,
1744          .experimental = 1,
1745          },
1746 };
1747
1748 static int dispatch_read(char *page, char **start, off_t off, int count,
1749                          int *eof, void *data)
1750 {
1751         struct ibm_struct *ibm = (struct ibm_struct *)data;
1752         int len;
1753
1754         if (!ibm || !ibm->read)
1755                 return -EINVAL;
1756
1757         len = ibm->read(page);
1758         if (len < 0)
1759                 return len;
1760
1761         if (len <= off + count)
1762                 *eof = 1;
1763         *start = page + off;
1764         len -= off;
1765         if (len > count)
1766                 len = count;
1767         if (len < 0)
1768                 len = 0;
1769
1770         return len;
1771 }
1772
1773 static int dispatch_write(struct file *file, const char __user * userbuf,
1774                           unsigned long count, void *data)
1775 {
1776         struct ibm_struct *ibm = (struct ibm_struct *)data;
1777         char *kernbuf;
1778         int ret;
1779
1780         if (!ibm || !ibm->write)
1781                 return -EINVAL;
1782
1783         kernbuf = kmalloc(count + 2, GFP_KERNEL);
1784         if (!kernbuf)
1785                 return -ENOMEM;
1786
1787         if (copy_from_user(kernbuf, userbuf, count)) {
1788                 kfree(kernbuf);
1789                 return -EFAULT;
1790         }
1791
1792         kernbuf[count] = 0;
1793         strcat(kernbuf, ",");
1794         ret = ibm->write(kernbuf);
1795         if (ret == 0)
1796                 ret = count;
1797
1798         kfree(kernbuf);
1799
1800         return ret;
1801 }
1802
1803 static void dispatch_notify(acpi_handle handle, u32 event, void *data)
1804 {
1805         struct ibm_struct *ibm = (struct ibm_struct *)data;
1806
1807         if (!ibm || !ibm->notify)
1808                 return;
1809
1810         ibm->notify(ibm, event);
1811 }
1812
1813 static int __init setup_notify(struct ibm_struct *ibm)
1814 {
1815         acpi_status status;
1816         int ret;
1817
1818         if (!*ibm->handle)
1819                 return 0;
1820
1821         ret = acpi_bus_get_device(*ibm->handle, &ibm->device);
1822         if (ret < 0) {
1823                 printk(IBM_ERR "%s device not present\n", ibm->name);
1824                 return 0;
1825         }
1826
1827         acpi_driver_data(ibm->device) = ibm;
1828         sprintf(acpi_device_class(ibm->device), "%s/%s", IBM_NAME, ibm->name);
1829
1830         status = acpi_install_notify_handler(*ibm->handle, ibm->type,
1831                                              dispatch_notify, ibm);
1832         if (ACPI_FAILURE(status)) {
1833                 printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
1834                        ibm->name, status);
1835                 return -ENODEV;
1836         }
1837
1838         return 0;
1839 }
1840
1841 static int __init ibm_device_add(struct acpi_device *device)
1842 {
1843         return 0;
1844 }
1845
1846 static int __init register_driver(struct ibm_struct *ibm)
1847 {
1848         int ret;
1849
1850         ibm->driver = kmalloc(sizeof(struct acpi_driver), GFP_KERNEL);
1851         if (!ibm->driver) {
1852                 printk(IBM_ERR "kmalloc(ibm->driver) failed\n");
1853                 return -1;
1854         }
1855
1856         memset(ibm->driver, 0, sizeof(struct acpi_driver));
1857         sprintf(ibm->driver->name, "%s_%s", IBM_NAME, ibm->name);
1858         ibm->driver->ids = ibm->hid;
1859         ibm->driver->ops.add = &ibm_device_add;
1860
1861         ret = acpi_bus_register_driver(ibm->driver);
1862         if (ret < 0) {
1863                 printk(IBM_ERR "acpi_bus_register_driver(%s) failed: %d\n",
1864                        ibm->hid, ret);
1865                 kfree(ibm->driver);
1866         }
1867
1868         return ret;
1869 }
1870
1871 static int __init ibm_init(struct ibm_struct *ibm)
1872 {
1873         int ret;
1874         struct proc_dir_entry *entry;
1875
1876         if (ibm->experimental && !experimental)
1877                 return 0;
1878
1879         if (ibm->hid) {
1880                 ret = register_driver(ibm);
1881                 if (ret < 0)
1882                         return ret;
1883                 ibm->driver_registered = 1;
1884         }
1885
1886         if (ibm->init) {
1887                 ret = ibm->init();
1888                 if (ret != 0)
1889                         return ret;
1890                 ibm->init_called = 1;
1891         }
1892
1893         if (ibm->read) {
1894                 entry = create_proc_entry(ibm->name,
1895                                           S_IFREG | S_IRUGO | S_IWUSR,
1896                                           proc_dir);
1897                 if (!entry) {
1898                         printk(IBM_ERR "unable to create proc entry %s\n",
1899                                ibm->name);
1900                         return -ENODEV;
1901                 }
1902                 entry->owner = THIS_MODULE;
1903                 entry->data = ibm;
1904                 entry->read_proc = &dispatch_read;
1905                 if (ibm->write)
1906                         entry->write_proc = &dispatch_write;
1907                 ibm->proc_created = 1;
1908         }
1909
1910         if (ibm->notify) {
1911                 ret = setup_notify(ibm);
1912                 if (ret < 0)
1913                         return ret;
1914                 ibm->notify_installed = 1;
1915         }
1916
1917         return 0;
1918 }
1919
1920 static void ibm_exit(struct ibm_struct *ibm)
1921 {
1922         if (ibm->notify_installed)
1923                 acpi_remove_notify_handler(*ibm->handle, ibm->type,
1924                                            dispatch_notify);
1925
1926         if (ibm->proc_created)
1927                 remove_proc_entry(ibm->name, proc_dir);
1928
1929         if (ibm->init_called && ibm->exit)
1930                 ibm->exit();
1931
1932         if (ibm->driver_registered) {
1933                 acpi_bus_unregister_driver(ibm->driver);
1934                 kfree(ibm->driver);
1935         }
1936 }
1937
1938 static void __init ibm_handle_init(char *name,
1939                                    acpi_handle * handle, acpi_handle parent,
1940                                    char **paths, int num_paths, char **path)
1941 {
1942         int i;
1943         acpi_status status;
1944
1945         for (i = 0; i < num_paths; i++) {
1946                 status = acpi_get_handle(parent, paths[i], handle);
1947                 if (ACPI_SUCCESS(status)) {
1948                         *path = paths[i];
1949                         return;
1950                 }
1951         }
1952
1953         *handle = NULL;
1954 }
1955
1956 #define IBM_HANDLE_INIT(object)                                         \
1957         ibm_handle_init(#object, &object##_handle, *object##_parent,    \
1958                 object##_paths, ARRAY_SIZE(object##_paths), &object##_path)
1959
1960 static int set_ibm_param(const char *val, struct kernel_param *kp)
1961 {
1962         unsigned int i;
1963
1964         for (i = 0; i < ARRAY_SIZE(ibms); i++)
1965                 if (strcmp(ibms[i].name, kp->name) == 0 && ibms[i].write) {
1966                         if (strlen(val) > sizeof(ibms[i].param) - 2)
1967                                 return -ENOSPC;
1968                         strcpy(ibms[i].param, val);
1969                         strcat(ibms[i].param, ",");
1970                         return 0;
1971                 }
1972
1973         return -EINVAL;
1974 }
1975
1976 #define IBM_PARAM(feature) \
1977         module_param_call(feature, set_ibm_param, NULL, NULL, 0)
1978
1979 IBM_PARAM(hotkey);
1980 IBM_PARAM(bluetooth);
1981 IBM_PARAM(video);
1982 IBM_PARAM(light);
1983 #ifdef CONFIG_ACPI_IBM_DOCK
1984 IBM_PARAM(dock);
1985 #endif
1986 IBM_PARAM(bay);
1987 IBM_PARAM(cmos);
1988 IBM_PARAM(led);
1989 IBM_PARAM(beep);
1990 IBM_PARAM(ecdump);
1991 IBM_PARAM(brightness);
1992 IBM_PARAM(volume);
1993 IBM_PARAM(fan);
1994
1995 static struct backlight_properties ibm_backlight_data = {
1996         .owner          = THIS_MODULE,
1997         .get_brightness = brightness_get,
1998         .update_status  = brightness_update_status,
1999         .max_brightness = 7,
2000 };
2001
2002 static void acpi_ibm_exit(void)
2003 {
2004         int i;
2005
2006         if (ibm_backlight_device)
2007                 backlight_device_unregister(ibm_backlight_device);
2008
2009         for (i = ARRAY_SIZE(ibms) - 1; i >= 0; i--)
2010                 ibm_exit(&ibms[i]);
2011
2012         remove_proc_entry(IBM_DIR, acpi_root_dir);
2013 }
2014
2015 static int __init acpi_ibm_init(void)
2016 {
2017         int ret, i;
2018
2019         if (acpi_disabled)
2020                 return -ENODEV;
2021
2022         if (!acpi_specific_hotkey_enabled) {
2023                 printk(IBM_ERR "using generic hotkey driver\n");
2024                 return -ENODEV;
2025         }
2026
2027         /* ec is required because many other handles are relative to it */
2028         IBM_HANDLE_INIT(ec);
2029         if (!ec_handle) {
2030                 printk(IBM_ERR "ec object not found\n");
2031                 return -ENODEV;
2032         }
2033
2034         /* these handles are not required */
2035         IBM_HANDLE_INIT(vid);
2036         IBM_HANDLE_INIT(vid2);
2037         IBM_HANDLE_INIT(ledb);
2038         IBM_HANDLE_INIT(led);
2039         IBM_HANDLE_INIT(hkey);
2040         IBM_HANDLE_INIT(lght);
2041         IBM_HANDLE_INIT(cmos);
2042 #ifdef CONFIG_ACPI_IBM_DOCK
2043         IBM_HANDLE_INIT(dock);
2044 #endif
2045         IBM_HANDLE_INIT(pci);
2046         IBM_HANDLE_INIT(bay);
2047         if (bay_handle)
2048                 IBM_HANDLE_INIT(bay_ej);
2049         IBM_HANDLE_INIT(bay2);
2050         if (bay2_handle)
2051                 IBM_HANDLE_INIT(bay2_ej);
2052         IBM_HANDLE_INIT(beep);
2053         IBM_HANDLE_INIT(ecrd);
2054         IBM_HANDLE_INIT(ecwr);
2055         IBM_HANDLE_INIT(fans);
2056         IBM_HANDLE_INIT(gfan);
2057         IBM_HANDLE_INIT(sfan);
2058
2059         proc_dir = proc_mkdir(IBM_DIR, acpi_root_dir);
2060         if (!proc_dir) {
2061                 printk(IBM_ERR "unable to create proc dir %s", IBM_DIR);
2062                 return -ENODEV;
2063         }
2064         proc_dir->owner = THIS_MODULE;
2065
2066         for (i = 0; i < ARRAY_SIZE(ibms); i++) {
2067                 ret = ibm_init(&ibms[i]);
2068                 if (ret >= 0 && *ibms[i].param)
2069                         ret = ibms[i].write(ibms[i].param);
2070                 if (ret < 0) {
2071                         acpi_ibm_exit();
2072                         return ret;
2073                 }
2074         }
2075
2076         ibm_backlight_device = backlight_device_register("ibm", NULL,
2077                                                          &ibm_backlight_data);
2078         if (IS_ERR(ibm_backlight_device)) {
2079                 printk(IBM_ERR "Could not register ibm backlight device\n");
2080                 ibm_backlight_device = NULL;
2081                 acpi_ibm_exit();
2082         }
2083
2084         return 0;
2085 }
2086
2087 module_init(acpi_ibm_init);
2088 module_exit(acpi_ibm_exit);